Cool duck



FIG. 1 is a front elevational view of the cool duck forming the subject matter of the design.

FIG. 2 is a top plan view thereof.

FIG. 3 is a right side elevational view thereof.

FIG. 4 is a left side elevational of view thereof.

FIG. 5 is a rear elevational view thereof; and,

FIG. 6 is a bottom plan view thereof. 

The ornamental design for a cool duck, as shown and described. 